Trouble with objectjava.io.notserializableException on class that is serialized

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Trouble with objectjava.io.notserializableException on class that is serialized

Hi, I have a simple course database program, that consists of an object including arraylists, that in turn include objects of different classes, like course and educator objects, and that uses breezyswing for gui.
The problem is, when I use my course editing class, which itself works withouth fail, and try to save the database object afterwards, I get the error objectjava.io.notserializableException, like the object would have turned into a non-serialized object. All the classes should though be serialized, and all the courses adding or deleting arraylist objects don't cause this problem.
So my question is, what am I doing wrong? I haven't been able to find a solution despite searching.

I'll put the most important classes here, excluding the main menu class, which is just a gui window.
Here's the course editing class:

Re: Trouble with objectjava.io.notserializableException on class that is serialized

Sorry for that, I though this site wasn't that connected to the other site. I just wanted to be sure I would get help, since I don't know which sites are best ones for it. Is there a way for me to delete this thread?

Re: Trouble with objectjava.io.notserializableException on class that is serialized

Originally Posted by Ildtris

Sorry for that, I though this site wasn't that connected to the other site. I just wanted to be sure I would get help, since I don't know which sites are best ones for it. Is there a way for me to delete this thread?

They are only connected through the fact that they attract similar audiences, meaning some common users. One of the links I provided above clearly explains the reasons why we ask for links to other forums. Most importantly - someone could waste their valuable time answering a question that has already been answered somewhere else.